Music blaring pass midnight

Ever since my next door neighbor built a laps right next to our boundary wall without our permission, we have been disturbed by their loud blaring music almost every weekend. We do not mind if they enjoy partying and having people around, as long as they do it with consideration. They party until after midnight, shouting to the music. It is now pass 1 am in the morning and the music is still blaring. Something needs to be done!